The GNOME Foundation Board voted to remove Sonny Piers as a member of the Board of Directors for cause, at a Special Meeting on May 17th, 2024, following the procedure outlined in the GNOME Bylaws, and remove him from all committees. Effective May 25th, 2024, his seat is now vacant, and in accordance with the Bylaws will be filled for the remainder of its term by an appointment made by the Board. A Code of Conduct complaint was also made against Sonny Piers. The Foundation is engaged in a media...
Very little is known as to why this happened, even by people deep within the GNOME project, so try to avoid wild speculation.
His main projects are on GitHub.